/* shoe1.c -- 把鞋码转换为英寸 */

#include <stdio.h>
#define ADJUST 7.31

int main(void)
{
  const double SCALE = 0.333;
  double shoe, foot;

  shoe = 9.0;
  foot = SCALE * shoe + ADJUST;

  printf("%.1f size = %.2f foot\n", shoe, foot);
  
  return 0;
}